Soil matrix rebound modulus testing device based on bearing plate method

Abstract

The utility model discloses a soil matrix rebound modulus testing device based on a bearing plate method, and relates to the technical field of soil matrix rebound modulus testing, the soil matrix rebound modulus testing device comprises a pressure device, a bearing plate, a displacement detection device and a control device, the pressure device is used for being arranged on a loading vehicle, the bearing plate is used for being arranged on a soil matrix, and the displacement detection device is arranged on the bearing plate. The control device is in signal connection with the pressure device and the displacement detection device, the control device can control the pressure device to apply vertically downward pressure to the bearing plate, and the displacement detection device can detect the displacement of the bearing plate when the bearing plate is pressed. The pressure device and the displacement detection device can transmit the pressure applied to the bearing plate and the displacement of the bearing plate to the control device, a mathematical model can be input in the control device in advance, and the rebound modulus of the soil matrix can be obtained according to the mathematical model input in advance, the displacement of the bearing plate and the value of the pressure applied by the pressure device. According to the device, test errors can be reduced, and test results are more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of soil foundation rebound modulus test, in particular to a soil foundation rebound modulus test device based on a bearing plate method. Background Art

[0002] The soil subgrade rebound modulus is one of the core technical indicators for pavement structure design. At present, the roadbed rebound modulus is mostly tested according to the "Highway Roadbed and Pavement Field Test Code" (JTG 3450-2019). In practice, the bearing plate method is widely used. The bearing plate method is to load and unload the bearing plate placed on the roadbed surface step by step, and use the bending instrument to measure the displacement value of the bearing plate. Based on the displacement obtained under each load level and the corresponding load, the soil subgrade elastic modulus is obtained by inverse calculation through the elastic half-space theory formula. However, in the actual bearing plate method test, a bending instrument is required, and the single Beckmann beam on the bending instrument weighs about 5kg and is 5.4m long, which is inconvenient to carry and use. Chinese patent CN214783773U discloses a bearing plate device for on-site soil foundation rebound modulus test. The device is provided with columns on both sides of the bearing plate, so that during the measurement process, the distance between the loading jack and the bearing plate can be adjusted conveniently and quickly according to the actual measurement environment, replacing the Beckman beam. However, during the test process, the device still needs to be read or operated manually, which will introduce human influence into the test process, resulting in large errors in the test results. At the same time, since the test is carried out by loading and unloading step by step, the test data at each level must be calculated in a complicated way to obtain the final rebound modulus of the measuring point, and large errors will also occur in the process of direct manual calculation on site. Therefore, there is an urgent need for a soil foundation rebound modulus test device based on the bearing plate method that can reduce the test error and make the test results more accurate. Utility Model Content

[0003] The utility model aims to provide a soil base rebound modulus test device based on a bearing plate method to solve the problems existing in the above-mentioned prior art, reduce test errors and make test results more accurate.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] The utility model provides a soil foundation rebound modulus test device based on a bearing plate method, comprising: a pressure device, a bearing plate, a displacement detection device and a control device, wherein the pressure device is used to be arranged on a loading vehicle, the bearing plate is used to be arranged on a soil foundation, the control device is respectively connected with the pressure device and the displacement detection device by signals, the control device can control the pressure device to apply vertical downward pressure to the bearing plate, the displacement detection device can detect the displacement of the bearing plate when the bearing plate is under pressure, the pressure device and the displacement detection device can transmit the pressure applied by the pressure device on the bearing plate and the displacement of the bearing plate to the control device, a mathematical model can be pre-input in the control device, and the rebound modulus of the soil foundation can be obtained according to the pre-input mathematical model, the displacement of the bearing plate and the pressure value applied by the pressure device.

[0006] Preferably, the displacement detection device includes a dial indicator, a first support member and a second support member, one end of the first support member is fixedly set on the ground, the dial indicator is fixedly set on the first support member, the probe of the dial indicator is upward, one end of the second support member is fixedly connected to the supporting plate, the second support member has a contact surface facing downward, the contact surface is contacted by the probe of the dial indicator, and the dial indicator is connected to the control device signal.

[0007] Preferably, the pressure device includes an electrically driven hydraulic jack and a pressure sensor, wherein the pressure sensor is capable of detecting the pressure of the electrically driven hydraulic jack on the bearing plate, and the pressure sensor and the electrically driven hydraulic jack are both connected to the control device signal.

[0008] Preferably, the pressure sensor is fixedly connected to the loading vehicle, the electrically driven hydraulic jack comprises an oil storage cylinder, a hydraulic cylinder, a power oil cylinder and a power piston rod, one end of the hydraulic rod of the hydraulic cylinder is connected to the pressure sensor, the cylinder body of the hydraulic cylinder is fixedly arranged on the bearing plate, the oil storage cylinder and the power oil cylinder are both fixedly connected to the bearing plate, the oil inlet of the oil storage cylinder is communicated with the oil outlet of the cylinder body of the hydraulic cylinder through a first pipeline, the oil inlet of the cylinder body of the hydraulic cylinder is communicated with the oil outlet of the power oil cylinder through a second pipeline, and the oil outlet of the oil storage cylinder is communicated with the oil inlet of the power oil cylinder through a third pipeline; the first pipeline is provided with a solenoid valve, the solenoid valve is connected to the control device by signal, and the control device can control the opening and closing of the solenoid valve; the second pipeline and the third pipeline are both provided with a one-way valve; the power piston is arranged in the power oil cylinder, the power piston is provided with a power motor, the power motor is connected to the control device by signal, and the control device can control the power motor to drive the power piston to reciprocate in the power oil cylinder.

[0009] Preferably, it further comprises a connecting assembly, one end of which is detachably connected to the loading vehicle, and the other end of which is detachably connected to one end of a hydraulic rod of a hydraulic cylinder.

[0010] Preferably, the connecting assembly includes a connecting rod and a connecting piece, one end of the connecting rod is detachably connected to the loading vehicle, the connecting piece is detachably connected to the hydraulic rod of the hydraulic cylinder, the pressure sensor is arranged between the connecting piece and the connecting rod, the upper side of the connecting piece has a mounting surface, the pressure sensor is detachably arranged on the mounting surface, and the end of the connecting rod away from the loading vehicle is detachably connected to the pressure detection end of the pressure sensor.

[0011] Preferably, the control device is a programmable control device.

[0012] Preferably, a plurality of displacement detection devices are provided, and each of the displacement detection devices is signal-connected to the control device.

[0013] Compared with the prior art, the utility model has achieved the following technical effects:

[0014] The utility model provides a soil foundation rebound modulus testing device based on the bearing plate method, which uses a displacement detection device instead of a Beckman beam, thereby avoiding the problem of the inconvenience of carrying and using the Beckman beam when the Beckman beam is used for testing; a control device is also provided, which can control the pressure device to apply pressure to the bearing plate, and can also obtain the soil foundation rebound modulus according to a pre-input mathematical model, the displacement of the bearing plate and the pressure value applied by the pressure device. The entire experimental process is completed through the control device, which reduces labor costs, improves work efficiency, and avoids errors caused by manual reading or manual calculation, making the test results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the structure of a soil base rebound modulus test device based on a bearing plate method provided by the utility model;

[0017] Figure 2 A schematic diagram of the structure of a control device in a soil base rebound modulus test device based on a bearing plate method provided by the utility model;

[0018] Figure 3 for Figure 1 Front view of the dial indicator;

[0019] In the figure: 1. Electric-driven hydraulic jack; 11. Hydraulic cylinder; 111. Cylinder body; 112. Hydraulic rod; 12. Oil storage cylinder; 13. Power cylinder; 14. Power piston; 15. First pipeline; 16. Second pipeline; 17. Third pipeline; 18. Solenoid valve; 19. Power motor; 2. Pressure detection device; 3. Loading plate; 4. Displacement detection device; 41. First support member; 42. Second support member; 43. Dial indicator; 431. Probe; 5. Control device; 6. Connecting assembly; 61. Connecting rod; 62. Connecting member; 7. Loading vehicle; 8. Soil foundation. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model aims to provide a soil base rebound modulus test device based on a bearing plate method to solve the problems existing in the above-mentioned prior art, reduce test errors and make test results more accurate.

[0022] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Embodiment 1

[0024] The present embodiment provides a soil base rebound modulus test device based on the bearing plate method, including: a pressure device, a bearing plate 2, a displacement detection device 4 and a control device 5, the pressure device is used to be set on a loading vehicle 7, the bearing plate 2 is used to be set on a soil base 8, the control device 5 is signal-connected with the pressure device and the displacement detection device 4 respectively, the control device 5 can control the pressure device to apply vertical downward pressure to the bearing plate 2, the displacement detection device 4 can detect the displacement of the bearing plate 2 when it is under pressure, the pressure device and the displacement detection device 4 can transmit the pressure applied by the pressure device on the bearing plate 2 and the displacement of the bearing plate 3 to the control device 5, the mathematical model can be input into the control device 5, and the rebound modulus of the soil base 8 can be obtained according to the pre-input mathematical model, the displacement of the bearing plate 2 and the pressure applied by the pressure device.

[0025] The soil base rebound modulus test device based on the bearing plate method provided in this embodiment can avoid the inconvenience of carrying and using the Beckman beam when using a deflectometer for testing in the original method; a control device 5 is also provided, and the control device 5 can control the pressure device to apply pressure to the bearing plate 2, and can also obtain the rebound modulus of the soil base 8 according to the pre-input mathematical model, the displacement of the bearing plate 2 and the pressure value applied by the pressure device. The entire experimental process is completed through the control device 5, which reduces labor costs, improves work efficiency, and avoids errors caused by manual reading or manual calculation, making the test results more accurate.

[0026] In a preferred implementation of the present embodiment, the displacement detection device 4 includes a dial indicator 43, a first support member 41 and a second support member 42. One end of the first support member 41 is fixedly arranged on the ground, the dial indicator 43 is fixedly arranged on the first support member 41, the probe 431 of the dial indicator 43 is upward, one end of the second support member 42 is fixedly connected to the bearing plate 2, the second support member 42 has a contact surface facing downward, the probe 431 of the dial indicator 43 contacts the contact surface, and the dial indicator 43 is connected to the control device 5 by signal. When the pressure device exerts pressure downward on the bearing plate 2, the bearing plate 2 presses the soil foundation 8 to deform, the bearing plate 2 moves downward, the bearing plate 2 can drive the second support member 42 to move downward, the contact surface of the second support member 42 can press down the probe 431 of the dial indicator 43, and the dial indicator 43 can display the displacement of the bearing plate when it is pressed and transmit it to the control device 5. Among them, the lower end of the first support member 41 is directly inserted into the ground and fixes the first support member 41 to the ground; the second support member 42 includes a horizontal bar and a vertical bar, one end of the vertical bar is fixedly connected to the upper side of the supporting plate 2, and the other end is connected to one end of the horizontal bar, and the other end of the horizontal bar is suspended, and the side head of the dial indicator 43 contacts the contact surface on the lower side of the horizontal bar.

[0027] In a preferred implementation manner of this embodiment, the pressure sensor is fixedly connected to the loading vehicle 7, the electrically driven hydraulic jack 1 includes an oil storage cylinder 12, a hydraulic cylinder 11, a power cylinder 13 and a power piston 14, one end of the hydraulic rod 112 of the hydraulic cylinder 11 is connected to the pressure sensor, the cylinder body 111 of the hydraulic cylinder 11 is fixedly arranged on the bearing plate 2, the oil storage cylinder 12 and the power cylinder 13 are both fixedly connected to the bearing plate 2, the oil inlet of the oil storage cylinder 12 is connected to the oil outlet of the cylinder body 111 of the hydraulic cylinder 11 through the first pipe 15, the oil inlet of the cylinder body 111 of the hydraulic cylinder 11 is connected to the oil outlet of the power cylinder 13 The oil outlet of the oil storage cylinder 12 and the oil inlet of the power oil cylinder 13 are connected through the second pipeline 16, and the third pipeline 17 is connected. The first pipeline 15 is provided with a solenoid valve 18, and the solenoid valve 18 is connected to the control device 5 by signal, and the control device 5 can control the opening and closing of the solenoid valve 18. The second pipeline 16 and the third pipeline 17 are both provided with a one-way valve. The power piston 14 is provided in the power oil cylinder 13, and the power piston 14 is provided with a power motor 19, and the power motor 19 is connected to the control device 5 by signal, and the control device 5 can control the power motor 19 to drive the power piston 14 to reciprocate in the power oil cylinder 13. Figure 1As shown, the oil inlet and the oil outlet of the power cylinder 13 are arranged at the same end of the power cylinder 13. When loading is required, the control device 5 sends instructions to the power motor 19 and the solenoid valve 18 on the first pipeline 15 to close the solenoid valve 18, and the power motor 19 controls the power piston 14 to reciprocate in the power cylinder 13. When the power piston 14 moves away from the oil inlet and the oil outlet of the power cylinder 13, the hydraulic oil in the oil storage cylinder 12 is drawn into the power cylinder 13 through the third pipeline 17. When the power piston 14 moves toward the oil inlet and the oil outlet of the power cylinder 13, the hydraulic oil in the power cylinder 13 is pressed into the cylinder body 111 of the hydraulic cylinder 11 through the second pipeline 16. With the multiple reciprocating motions of the power piston 14, the hydraulic cylinder 11 is continuously filled with hydraulic oil, and the hydraulic rod 112 can gradually extend out of the cylinder body 111; when the pressure reaches a certain value and needs to be maintained, the control device 5 controls the power motor 19 and the solenoid valve 18 on the first pipeline 15 to remain closed, so that the length of the hydraulic rod 112 extending out of the cylinder body 111 no longer changes; when unloading is required, the control device 5 sends an opening command to the solenoid valve 18 on the first pipeline 15, and at the same time controls the first motor to close, and the hydraulic rod 112 can gradually return to the cylinder body 111 of the hydraulic cylinder 11 under the action of the pressure of the hydraulic rod, and the hydraulic oil in the hydraulic cylinder 11 can also return to the oil storage cylinder 12 through the first pipeline 15. Among them, the volume of the power cylinder 13 is smaller than the volume of the oil storage cylinder 12 and the cylinder body 111 of the hydraulic cylinder 11; the oil storage cylinder 12 is arranged outside the cylinder body 111 of the hydraulic cylinder 11, and the inner wall of the oil storage cylinder 12 and the outer wall of the cylinder body 111 of the hydraulic cylinder 11 share an annular side wall; an electronic limit device can be set in the power cylinder 13 to make the power piston 14 reciprocate, and the electronic limit device is set at one end of the power cylinder away from the oil outlet and the oil inlet. The electronic limit device can detect the position of the power piston 14. When the power piston 14 moves away from the oil outlet and the oil inlet of the power cylinder 13, after the power piston 14 moves to a certain position, the electronic limit device will send a signal to the control device 5, and the control device 5 will control the power piston 14 to move in the opposite direction.

[0028] In a preferred implementation manner of this embodiment, the soil base rebound modulus testing device based on the bearing plate method provided in this embodiment also includes a connecting component 6, one end of the connecting component 6 is detachably connected to the loading vehicle 7, and the other end is detachably connected to one end of the hydraulic rod 112 of the hydraulic cylinder 11.

[0029] In a preferred implementation of this embodiment, the connection assembly 6 includes a connecting rod 61 and a connecting member 62. One end of the connecting rod 61 is detachably connected to the loading vehicle 7. The connecting member 62 is detachably connected to the hydraulic rod 112 of the hydraulic cylinder 11. The pressure sensor is arranged between the connecting member 62 and the connecting rod 61. The upper side of the connecting member 62 has a mounting surface. The pressure sensor is detachably arranged on the mounting surface. One end of the connecting rod 61 away from the loading vehicle 7 is detachably connected to the pressure detection end of the pressure sensor. The displacement sensor is arranged on the loading vehicle 7 through the connecting rod 61. When the hydraulic rod 112 of the hydraulic cylinder 11 is extended, the hydraulic rod 112 applies pressure to the connecting member 62. The connecting member 62 transmits the pressure to the pressure sensor. The pressure sensor then transmits the pressure to the connecting rod 61. The connecting rod 61 applies the pressure to the loading vehicle 7. The contact surface extends in the horizontal direction. The contact surface and the pressure sensor can keep the pressure sensor and the connecting member 62 parallel to each other through contact, so as to avoid the pressure sensor slipping during loading and affecting the accuracy of the test.

[0030] In a preferred implementation of this embodiment, the control device 5 is a programmable control device. Specifically, the control device 5 includes a control device and a computer, and the control device and the computer are connected via Bluetooth.

[0031] In a preferred implementation of this embodiment, a plurality of displacement detection devices 4 are provided, and each displacement detection device 4 is signal-connected to the control device 5. During the test, the control device 5 can obtain the displacement values ​​on the plurality of displacement detection devices 4 and obtain the average as the measured displacement value, thereby reducing the error and making the test result more accurate.

[0032] Embodiment 2

[0033] When using the soil base rebound modulus test device based on the bearing plate method in Example 1 to conduct the test, the steps are as follows:

[0034] Test preparation: clean the surface of the soil foundation 8 to ensure that there is no debris on the surface of the soil foundation 8; use a truck with a rear axle weight of not less than 60kN as the loading vehicle 7, use a floor scale to weigh the load Q of the loading vehicle 7 on the soil foundation 8 when it is parked on the soil foundation 8, and at the same time, measure the wheelbase T1 between the front and rear axles of the loading vehicle 7, set a stiffening beam near the rear axle of the vehicle, measure the distance T2 between the stiffening beam and the rear axle of the vehicle, and park the loading vehicle 7 at the test point of the soil foundation 8 rebound modulus; sprinkle a small amount of dry and clean fine sand on the surface of the soil foundation 8 (the fine sand cannot cover the entire surface of the soil foundation 8 at the measuring point to avoid the accumulation of fine sand affecting the test results); hang a plumb bob on the stiffening beam, place a bearing plate 2 with a diameter of D and a thickness of h on the surface of the soil foundation 8, and align the center of the bearing plate 2 with the tip of the plumb bob, and use a level ruler to calibrate the bearing plate 2 horizontally, and put away the plumb bob after the calibration is completed.

[0035] Install the pressure device and the displacement detection device 4: arrange and connect the pressure sensor, the connecting rod 61, the connecting member 62 and the hydraulic cylinder 11 stiffening beam to the bearing plate in sequence, then fix the first support member 41 on the ground, and fix the second support member 42 on the bearing plate, and adjust the probe 431 of the dial indicator 43 to contact the contact surface on the second support member 42; then connect the data interface of the control device 5 to the data interfaces of the pressure sensor, the power motor 19, the solenoid valve 18 and the dial indicator 43 respectively.

[0036] Test process: Turn on the control device 5, and the test is automatically controlled by the control device 5. The test steps include:

[0037] Preloading: According to the test principle of the elastic modulus of the soil base 8 of the bearing plate method, in order to ensure the close contact between the rigid bearing plate 2 and the soil base 8, preloading is required before the formal loading and unloading test. The control device 5 controls the power piston 14 to reciprocate in the power cylinder 13 to supply oil to the hydraulic cylinder 11, and the pressure device applies pressure to the bearing plate 2. When the pressure value obtained on the pressure sensor on the control device 5 is the set value (the set value is preferably 0.05MPa-0.1MPa), the control device 5 sends a stop boost signal to the pressure device, and controls the power piston 14 to stop moving and maintain the pressure value. After maintaining the pressure for 1 minute, the control device 5 controls the solenoid valve 18 to open, and the hydraulic oil returns to the oil storage cylinder 12 through the first pipeline 15. The pressure device releases the pressure on the bearing plate 2 and completes the preloading; after that, the dial indicator 43 is manually adjusted to zero so that the side head of the dial indicator contacts the contact surface.

[0038] Step-by-step loading and unloading test: The control device 5 controls the pressure device to apply P to the load plate. i =0.2MPa pressure. When the pressure sensor detects that the pressure value is 0.2MPa, the control device 5 sends a command to the pressure device to stop pressurizing and maintain the pressure value. After maintaining the pressure for 1 minute, the control device 5 reads the displacement value w on the two dial gauges. 前 Then the control device 5 sends an unloading instruction to the pressure device. After unloading for 1 minute, the control device reads the displacement value w on the dial gauge 43. 后 Then, the pressure of the pressure device on the load plate is increased, and multiple levels of 0.4MPa, 0.6MPa, etc. are loaded multiple times and the data are recorded respectively.

[0039] Among them, in order to ensure that the value on the dial indicator 43 will not be input into the control device 5 during the preloading process, the control device 5 can determine whether to preload according to the value on the pressure sensor. When the value on the pressure sensor is less than 0.1MPa, the control device 5 will not receive the value on the dial indicator 43. When the value on the pressure sensor is greater than 0.1MPa, the control device 5 will receive the value on the pressure sensor.

[0040] Determination of the influence quantity: Remove the pressure device, and the control device reads the data on the dial indicator 43 and records it as w 移除压力装置后 Then the loading vehicle is driven away, and the control device reads the data on the dial indicator and records it as w 加载车驶出后 .

[0041] Data calculation: The following mathematical model is pre-entered in the control device, and the following data can be calculated:

[0042] (1) Total impact:

[0043] a=w 移除千斤顶后 -w 加载车驶出后

[0044] (2) Influence quantity at each level of pressure:

[0045]

[0046] Where:

[0047] a i is the influence quantity under the i-th level load; T1 is the front and rear wheelbase of the loading vehicle; T2 is the distance between the stiffening beam and the rear axle of the truck; D is the diameter of the load-bearing plate; p i is the bearing plate pressure under the i-th level load; a is the total influence.

[0048] (3) Calculation value of elastic modulus deformation:

[0049] L i =d i +a i

[0050] Where: d i is the empirical value of the elastic modulus at each level of pressure, d i =w 前i -w 后i ; a i is the influence quantity under the i-th level load.

[0051] (4) Soil foundation rebound modulus under various loads:

[0052]

[0053] Where: E iis the soil resilience modulus under the corresponding i-th level load; μ0 is the Poisson's ratio of the soil; L i is relative to the load p i The calculated value of the i-th level springback deformation at

[0054] (5) Value of soil resilience modulus at the test point:

[0055]

[0056] In addition, in the above calculation process, if there are multiple dial gauges, the average value of the values ​​measured by the multiple dial gauges is calculated during loading and after unloading, and the average value is recorded as and

[0057] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A soil base rebound modulus test device based on the bearing plate method, characterized in that: include: A pressure device, a bearing plate, a displacement detection device and a control device, wherein the pressure device is used to be set on a loading vehicle, and the bearing plate is used to be set on a soil foundation. The control device is signal-connected with the pressure device and the displacement detection device respectively. The control device can control the pressure device to apply vertical downward pressure to the bearing plate, and the displacement detection device can detect the displacement of the bearing plate when it is under pressure. The pressure device and the displacement detection device can transmit the pressure applied by the pressure device on the bearing plate and the displacement of the bearing plate to the control device. A mathematical model can be pre-input in the control device, and the rebound modulus of the soil foundation can be obtained according to the pre-input mathematical model, the displacement of the bearing plate and the pressure applied by the pressure device.

2. The soil base rebound modulus test device based on the bearing plate method according to claim 1 is characterized in that: The displacement detection device includes a dial indicator, a first support member and a second support member, one end of the first support member is fixedly set on the ground, the dial indicator is fixedly set on the first support member, the probe of the dial indicator is upward, one end of the second support member is fixedly connected to the supporting plate, the second support member has a contact surface facing downward, the contact surface is contacted by the probe of the dial indicator, and the dial indicator is connected to the control device signal.

3. The soil base rebound modulus test device based on the bearing plate method according to claim 1 is characterized in that: The pressure device includes an electrically driven hydraulic jack and a pressure sensor. The pressure sensor can detect the pressure of the electrically driven hydraulic jack on the bearing plate. Both the pressure sensor and the electrically driven hydraulic jack are connected to the control device by signals.

4. The soil base rebound modulus test device based on the bearing plate method according to claim 3 is characterized in that: The pressure sensor is fixedly connected to the loading vehicle. The electrically driven hydraulic jack comprises an oil storage cylinder, a hydraulic cylinder, a power oil cylinder and a power piston rod. One end of the hydraulic rod of the hydraulic cylinder is connected to the pressure sensor. The cylinder body of the hydraulic cylinder is fixedly arranged on the bearing plate. The oil storage cylinder and the power oil cylinder are both fixedly connected to the bearing plate. The oil inlet of the oil storage cylinder is communicated with the oil outlet of the cylinder body of the hydraulic cylinder through a first pipeline. The oil inlet of the cylinder body of the hydraulic cylinder is communicated with the oil outlet of the power oil cylinder through a second pipeline. The oil outlet of the oil storage cylinder is communicated with the oil inlet of the power oil cylinder through a third pipeline. The first pipeline is provided with an electromagnetic valve, which is connected to the control device by signal, and the control device can control the opening and closing of the electromagnetic valve. The second pipeline and the third pipeline are both provided with a one-way valve. The power piston is arranged in the power oil cylinder, and a power motor is provided on the power piston. The power motor is connected to the control device by signal, and the control device can control the power motor to drive the power piston to reciprocate in the power oil cylinder.

5. The soil base rebound modulus test device based on the bearing plate method according to claim 4 is characterized in that: It also includes a connecting component, one end of which is detachably connected to the loading vehicle, and the other end of which is detachably connected to one end of a hydraulic rod of a hydraulic cylinder.

6. The soil base rebound modulus test device based on the bearing plate method according to claim 5 is characterized in that: The connecting assembly includes a connecting rod and a connecting piece, one end of the connecting rod is detachably connected to the loading vehicle, the connecting piece is detachably connected to the hydraulic rod of the hydraulic cylinder, the pressure sensor is arranged between the connecting piece and the connecting rod, the upper side of the connecting piece has a mounting surface, the pressure sensor is detachably arranged on the mounting surface, and the end of the connecting rod away from the loading vehicle is detachably connected to the pressure detection end of the pressure sensor.

7. The soil base rebound modulus test device based on the bearing plate method according to claim 1 is characterized in that: The control device is a programmable control device.

8. The soil base rebound modulus test device based on the bearing plate method according to claim 1 is characterized in that: A plurality of displacement detection devices are provided, and each of the displacement detection devices is signal-connected to the control device.

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